This book provides a comprehensive analysis of EU legislation in the area of legal migration. Five Directives on family reunification, long-term residence, students, researchers and highly qualified migrants are critically assessed. Moreover, the implementation of the Directives in three Member States (Germany, the Netherlands and Sweden) and national legislation in two Member States with an opt-out from EU migration law (the UK and Netherlands) are assessed. This includes national rules on the integration of third-country nationals and access to citizenship. The book calls into question the compliance of several European and national provisions with EU principles of law and international human rights.